We present flattened supercontinuum generation from a micro-resonator-based frequency comb for the calibration of astronomical spectrographs. Micro-resonator-based frequency combs, also known as microcombs, exhibit inherently high mode spacing owing to their compact cavity size. Applying a tailored photonic crystal fiber (PCF) taper, the spectrum of a 12 GHz microcomb is broadened to more than one octave from 1.0 μm to 2.2 μm. The resulting supercontinuum is smoothed using a spatial light modulator based spectral flattener, producing a flat-top broadband supercontinuum that serves as a powerful source for precision astronomical spectroscopy.
e report a latest generation of the laser frequency comb (LFC) for astronomy. The new features include all fiber coupled, alignment-free filter cavities; specially designed photonic crystal fiber for spectral broadening; reflective spectral flattening systems. All the features ensure the long-term stability of the whole LFC system. The LFC is designed to operate in two modes. The visible mode generates a supercontinuum from 445 nm to 870 nm, that covers 100 % spectral range of the Keck Planet Finder (KPF) spectrograph. The near-infrared mode offers a flat-top supercontinuum from 915 nm to 1450 nm, is prepared as a calibration source of the short-wavelength part of a near infrared (NIR) spectrograph
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